Introduce MouriMap

MouriMap is a local-tonemapping algorithm optimized for near-exact
preservation of SDR/LDR regions, while trying to do a good job of
rendering HDR. MouriMap was designed to run well on mobile hardware.

On a Pixel 8 Pro, MouriMap is able to tonemap screen-sized images
between 20 and 25 milliseconds. This is not fast enough for real-time
rendering at the panel refresh rate. But, this is sufficient for
screenshots, which is the use-case that MouriMap is intended to be
deployed for.

Tests will follow after this patch.

Bug: 329464641
Test: builds, boots
Test: Swipe apps into Recents
Test: adb screenshot
Change-Id: I0ded29b65ccf41940de74cff26d36275bfa46e78